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단신 : 페달링 시 정량적인 동적 피팅을 위한 실시간 평가 시스템
이주학 ( Joo Hack Lee ),강동원 ( Dong Won Kang ),배재혁 ( Jae Hyuk Bae ),신윤호 ( Yoon Ho Shin ),최진승 ( Jin Seung Choi ),탁계래 ( Gye Rae Tack ) 한국운동역학회 2014 한국운동역학회지 Vol.24 No.2
In this study, a real-time evaluation system for quantitative dynamic fitting during pedaling was developed. The system is consisted of LED markers, a digital camera connected to a computer and a marker detecting program. LED markers are attached to hip, knee, ankle joint and fifth metatarsal in the sagittal plane. Playstation3 eye which is selected as a main digital camera in this paper has many merits for using motion capture, such as high FPS (Frame per second) about 180FPS, 320×240 resolution, and low-cost with easy to use. The maker detecting program was made by using Labview2010 with Vision builder. The program was made up of three parts, image acquisition & processing, marker detection & joint angle calculation, and output section. The digital camera`s image was acquired in 95FPS, and the program was set-up to measure the lower-joint angle in real-time, providing the user as a graph, and allowing to save it as a test file. The system was verified by pedalling at three saddle heights (knee angle: 25, 35, 45o) and three cadences (30, 60, 90 rpm) at each saddle heights by using Holmes method, a method of measuring lower limbs angle, to determine the saddle height. The result has shown low average error and strong correlation of the system, respectively, 1.18±0.44o, 0.99±0.01o. There was little error due to the changes in the saddle height but absolute error occurred by cadence. Considering the average error is approximately 1°, it is a suitable system for quantitative dynamic fitting evaluation. It is necessary to decrease error by using two digital camera with frontal and sagittal plane in future study.
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최대 및 최대하 페달링 시 무릎각도법을 이용한 사이클 안장높이 결정에 대한 기초연구
최진승(Jin Seung Choi),배재혁(Jae Hyuk Bae),강동원(Dong Won Kang),신윤호(Yoon Ho Shin),이주학(Joo Hack Lee),탁계래(Gye Rae Tack) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.53
The purpose of this study was to identify the applicability of the knee angle method during submaximal (SUB) and maximal (MAX) pedaling, and to compare with the movement of hip and ankle joint. Six cyclists(age: 34.6±5.6years, height: 174.2±5.7cm, weight: 84.8±7.6kg, career: 15.8±9.2years) participated in this experiment. 3D motion analysis system was used to acquire the movement of lower limb. Using these motion data, hip, knee and ankle joint angle were calculated. To compare SUB and MAX pedaling pattern, knee joint angle, minimum angle and range of motion (ROM) of each joint were used. Result showed that the knee angle method can be applied regardless of changes of cadence, in other words, both knee angles were in the range from 25° to 35° suggested by knee angle method. There were significant differences in the timing of minimum ankle joint of MAX and those of SUB, but those were not directly related to the changes of the knee joint angle. To clarify those causes, it is necessary to perform further study using ankle strategy for improving pedaling and preventing injury.
ScienceON
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